Ethereum is often called "the second cryptocurrency after Bitcoin," but that's not entirely accurate. Bitcoin was primarily conceived as digital money and a store of value. Ethereum has gone further: it has become a platform for running applications, issuing tokens, creating financial services, and managing assets without traditional intermediaries.
This is why Ethereum has become one of the main pillars of DeFi —decentralized finance, or blockchain- based financial services : exchanges, lending protocols, stablecoins , derivatives, and yield platforms.
**1. WHAT IS ETHEREUM IN SIMPLE WORDS
**Ethereum is a public blockchain network. The blockchain can be thought of as a shared database, copies of which are stored by multiple network participants. Its records cannot be easily rewritten retroactively; to do so would require deceiving the majority of the system.
The main difference between Ethereum and Bitcoin is its support for smart contracts . A smart contract is a program on the blockchain that automatically executes specified conditions.
A simple example: if a user sends token A, the smart contract issues them token B according to predefined rules. There's no need for an operator, cashier, or bank to manually confirm the transaction. The code does it all.
**2. WHY DO WE NEED ETH?
**ETH isn't just a coin for trading on an exchange. It has several roles within the network.
First, ETH is used to pay fees. Every action on Ethereum —transferring tokens, trading on a decentralized exchange, issuing NFTs, interacting with a lending protocol—requires a fee. This fee is often referred to as "gas . " Gas is the cost of computing the network performs.
Secondly, ETH plays a role in network security. Since Ethereum's transition to a Proof-of-Stake mechanism , validators maintain security. A validator is a participant who locks up a certain amount of ETH and helps confirm new blocks. They receive a reward for honest work, but may lose some funds for violations.
Third, ETH has become a base asset for many DeFi protocols: it is used as collateral, a trading pair, and a liquidity tool.
**3. HOW ETHEREUM PROCESSES TRANSACTIONS
**When a user sends a transaction, it enters the network. Validators check whether it's valid: whether there are sufficient funds, whether the signature is correct, and whether the user is trying to spend the same asset twice.
Once verified, the transaction is included in a block. A block is a "batch" of transactions over a certain period of time. The block is then appended to the chain of previous blocks—hence the word " blockchain ."
In practice, this means Ethereum operates like a global computer: users send commands, the network verifies them, and records the results. CoinDesk explains Ethereum as a blockchain network designed for applications that are controlled by code, not by a single company or central operator.
**4. SMART CONTRACTS: THE HEART OF ETHEREUM
**Smart contracts are a key reason why Ethereum has become the foundation of DeFi .
They enable the creation of financial services without traditional infrastructure. For example:
• decentralized exchanges;
• credit platforms;
• stablecoins ;
• tokenized assets;
• insurance protocols;
• DAOs are communities with token voting.
If in traditional finance you need a bank, broker, depository, or payment system, then in DeFi, some of these functions are performed by a smart contract.
But it's important to understand: a smart contract isn't "intelligent" in the human sense. It doesn't assess the situation or exercise common sense. It simply executes code. If there's an error in the code, the consequences can be serious.
**5. WHY ETHEREUM BECAME THE BASIS FOR DEFI
**Ethereum isn't the only blockchain with smart contracts. There's also Solana, BNB Chain, Avalanche, Tron, Near, and other networks . But Ethereum gained an advantage before many competitors.
**Strong network effect
**A network effect is a situation where the value of a system grows with the number of participants. Ethereum already has many developers, users, wallets, protocols, analytics services, and infrastructure companies.
Simply put, new projects often choose Ethereum not because it's always cheaper or faster, but because it already has an audience, capital, and proven tools.
**High liquidity
**For DeFi, liquidity is the lifeblood of the system. If there's not enough money on an exchange, exchanges become expensive and inconvenient. If a lending protocol has insufficient collateral, it can't function properly.
Ethereum has become a hub for large amounts of capital, which has attracted new protocols, and these new protocols have attracted even more users.
**Token standards
**Ethereum has provided the market with clear standards. For example, ERC-20 is a popular token format. Thanks to it, wallets, exchanges, and applications understand how to work with thousands of different assets.
It's like a common language: if all market participants use the same standard, integrations become easier.
**Trust in infrastructure
**Ethereum has been operating since 2015 and has experienced numerous market cycles, overloads, and upgrades. This doesn't make it risk-free, but it does provide the market with a track record.
Toobit materials Ethereum is no longer described as a "gamble," but as the infrastructure on which stablecoins , tokenized assets, DeFi , and real-world settlement flows are built.
**6. HOW DEFI WORKS ON ETHEUM
**DeFi protocols are a set of smart contracts that users interact with through a wallet. Typically, the process looks like this:
- the user connects a wallet, for example MetaMask or Rabby ;
- selects an action: exchange, deposit, loan, liquidity provision;
- confirms the transaction;
- the smart contract performs the operation;
- The result is recorded in the blockchain . For example, a decentralized exchange doesn't have a traditional order book like a centralized platform. Instead, they often use liquidity pools. A liquidity pool is a shared reserve of two or more tokens from which users can trade. Those who contribute assets to the pool may receive a share of the fees, but they also assume market risks. In DeFi lending protocols, users can stake assets or borrow against collateral. All terms—collateral, rate, and liquidation—are specified in smart contracts.
7. ETHEUM PROBLEMS: FEES, SPEED, AND COMPLEXITY
Ethereum has its weaknesses.
The main pain point for users is fees. When the network is congested, transactions can become expensive. This is especially inconvenient for small amounts.
The second problem is scalability, that is, the network's ability to process large numbers of transactions quickly and cheaply. Ethereum addresses this through upgrades and second-layer networks. Second-layer networks, or Layer 2, are solutions on top of Ethereum that process some transactions more cheaply and then transmit the resulting data to the main network. Examples: Arbitrum , Optimism , Base , zkSync .
The third problem is complexity for beginners. It's important to understand fees, networks, addresses, smart contract permissions, and the risks of phishing. A mistake can be costly.
8. DEFI RISKS ON ETHEUM
DeFi offers more autonomy, but it removes the usual user protections. There's no bank manager to reverse an erroneous transfer.
Main risks:
• smart contract error;
• protocol hacking;
• loss of access to wallet;
• phishing sites;
• a sharp drop in collateral and liquidation;
• low liquidity of individual tokens;
• regulatory uncertainty.
blockchain transparency with complete security. Yes, transactions are visible on the network. But if the code is poorly written or a user signs a malicious transaction, transparency won't save you.
RESULT
Ethereum operates as an open blockchain platform for programmable finance. ETH is used for fees, network security, and as the ecosystem's underlying asset. Smart contracts enable the launch of applications that operate without a centralized operator.
It's the combination of technology, liquidity, developers, and trust that has made Ethereum the foundation of DeFi . But using this ecosystem requires careful consideration: understand fees, verify protocols, monitor wallet security, and remember that DeFi brings not only new opportunities but also new risks.
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